package day11.CRUD;

import com.mysql.jdbc.Connection;

import java.io.IOException;
import java.io.InputStream;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import java.util.concurrent.locks.Condition;

public class JdbcUtils {

    private static String driver = null;
    private static String url = null;
    private static String username = null;
    private static String password = null;

    static {
        try{
            InputStream in = JdbcUtils.class.getClassLoader().getResourceAsStream("db.properties");
            Properties prop = new Properties();
            prop.load(in);

            driver = prop.getProperty("driver");
            url = prop.getProperty("url");
            username = prop.getProperty("username");
            password = prop.getProperty("password");

        } catch (Exception e) {
            throw new ExceptionInInitializerError(e);
        }
    }

    public static Connection getConnection() throws SQLException{
        return (Connection) DriverManager.getConnection(url, username, password);
    }

    public static void release(Connection conn, Statement st, ResultSet rs) {

        if (rs!=null){
            try{
                rs.close();
            }catch (Exception e){
                e.printStackTrace();
            }
            rs = null;
        }
        if (st!=null) {
            try {
                st.close();
            }catch (Exception e){
                e.printStackTrace();
            }
        }
        if (conn!=null) {
            try{
                conn.close();
            }catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
